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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a4aa2d60eb61a85b974bdba69f4219ceba1b7dc0adc82e5ced822c834619b8' 
  AND token = 'Ccl73AGvi+tikhVpkU5WBeceFyeP7lYjoouCfvQaCrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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