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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9805220b1ead4d8f491179f77ae6a5046a7fb98feec78de74ddca46821019f6' 
  AND token = 'QmcpllXeDnSEjSLkvJmzlg5bgT0Y23Xw2KOVB+cib08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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