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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea09ba09a00fd07a8a82541c2cd5bdc0f2ca5212ab6ee4e7be5ecf909ae5d70f' 
  AND token = 'T0pXdTM6lxxGWch/4UCjzTG4bsV002bOmZMvTu1wjSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}