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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff99dc5c9a9582b62edddf354ff323f6e82745a83f3f2a44f2c792b837e82ccf' 
  AND token = 'i5V+J6gwb+Zc6Aggvgb7Ii+PaQM7Tj48spBOz8lUs2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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