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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59319e6ff40923b5ab7578ef16b03a34d4dad74d033a9c685a8c76a4ce9df06' 
  AND token = 'LlnK8VLrvYVaw13dR+48VqYMIEsZSIQHUoSofc7VCmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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