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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f824fbfa2c81c246f68de32cb212fa4c79dc8b09e668e83b9408097f92fb12da' 
  AND token = 'Jeq/1YE0YTTFOqq9pagyKZUMAxtyMRME26pUzQc/ZUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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