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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a30f4a78a0aa5790bb64ef1a39f9574e29cec8726c6d611fee6448725f72ca7' 
  AND token = 'tF2KbUEu6ddy5d9vCMf3ahBP3hUBJzZxXX7QBdvhz+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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