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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34eed8b3bdd2b55779234d290ba0decd9a97d1955563496854d15e71dee7688e' 
  AND token = 'K9qnBmpZLraTNvZt/uTKIgYJXUDGBCPwtS5Sudq7nys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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