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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfd5c203c47418de9bc81c9c33fc62ec889c32a315b89a7fb8267824790d41b' 
  AND token = 'KaIruYgF4rB2QUB9LfLBeTyzZzDQCv1Ed88rK1XYLqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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