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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee3dfdd837f57aa26ce21da6b0ae0fa2eb781cd6b2b0a208fc0fead496186ff' 
  AND token = 'gL27pqt03FbPuOWV7NZiPx9d3782UDb9CzIctMKtGJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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