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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a632fd6c7c9145e91ee8165ce2d5c727b4f43e8363f053906db6886683bff6f0' 
  AND token = 'hPwohbiJEret9E+x6f1XgXIEE/aeHYOUQtPZxJES9as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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