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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6b8c0a06ba4f6eec9cb2578a91fbc0e9e3cccc5e132e02e82fbbe0a7ead560' 
  AND token = 'XM76yPrP58X7jYzLF8sO6KqCYaNjhF0wrUPqTWJZ+2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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