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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a44b7982226ac3543983c132cb2c3222fd6e843a25a38ee39ca71bfacd7989' 
  AND token = '5TtOHYu8hM0lplWki5EXllrVqmiK0XOjq5gDaqUiVoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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