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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5526b3585af4aebe5f813c5d9b1600dfb2bce678fc141c4c6eff13e28af2f45e' 
  AND token = 'X9Cb5StoCc53mk8P4BMheOaU6lUDVVVWGRtUvwIy0To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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