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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e41f53e28c56c81535728b04b11888869cdfafb250dc98d86bb07d27202ed6d' 
  AND token = 'kyCe3bfxw5yBtwfUp24pb4A8JfDPEM4GgYy+rLo09dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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