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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46625a26fe3781d858d3888bc917d251a5a634fdb919617be70f9319eabc3e6' 
  AND token = 'k2vm0g0XSiAocSz8pMHlQWc8YOQtsSK/67BcTk7xrKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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