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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb070a802ffd1895cf91a6a1cb979f62a73689548c1f7579af44a8bb003fc65e' 
  AND token = 'b8BxNQhVQfWPdH0g2aFe8IhiGhlTKL+YxFAqAuNSas4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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