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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df4dd516a906b20f57add239b6331199b064f95b66c6e69ade77e0786f85d92' 
  AND token = 'NqAX3+Q/66/sFiQ0dXsOaZxXXZFM3iiWq7oJeeg1fiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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