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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2ab8fac65449af864573c8dd46fdb3fc83a319d0b3237dee21526aa168fdba' 
  AND token = '6vAcz+4GETaFba/q0znqfyjAzFJOJue5wnG/2BV89fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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