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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b988aed860e86f3e741c4c995c826a04c6efe178680166e022e5a06dcf503127' 
  AND token = 'N8REJsom01UgRDHFAYb38X2G9n/B+OPUKxBuhilqmSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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