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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01bcf8ac3725f7b8b2d70ff3b4bc4c6e90515163b56e3b3c8054f24def16eca' 
  AND token = 'QIwazKGn22txFSRony0CH+sfe9ghNVc5uOEhuuqmxJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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