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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6dfb7fabfb3df0f63ac767d17f0ff3a385668ec1100f659743be53e40028fd' 
  AND token = 'Rgo7YLKEOKzyoFXz0v5aUc1rzt9FSa+Bd2mwcn6yEpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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