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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c96e724fbb9819578203467ad5979abc3b66e1e9162fed08bc672e16d223099' 
  AND token = 'ZMaqVbsFNTq8P1B0g75L3QRCl/46Oqz8NJGQ7ODZBf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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