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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6155f30c08e98f098fdbed4f3ddf2a8302f1f7b5270f38bc94725dc5d8317e' 
  AND token = 'KLo+w3EWZq8jhD/7DUJxUoGp7dWrbsCMdMNZ2N7ov3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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