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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49d115cc17a305fe5ae652206cd4fc70f7ab1468f439f8180a0fbf89b34a7603' 
  AND token = 'dlE6cbIojL+ZW9K6BTF6Hqf9eSn0zGKBNUGtGR6o29s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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