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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2306642ba9593dddbe0e35b7479e5329e72641b3fc0f67ebb5f889d333194582' 
  AND token = 'J+vArhVqc4wc3x0JEots8aH8xTNPDfEi7Bd+y/6hY08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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