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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a6092838e429dc089b67d30ddbc74b17c0d4ed1d8be3ca7ba7029caf013c08' 
  AND token = 'VTjZbZYt94Ue3yT5OD/59Qx/qMHcL61TBAzR7phn8MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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