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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182d7be714334bcfd8d57053d4b8577554afa4adb0d4cf7f0212e7e666786d76' 
  AND token = '1KhcmRqDGl+AzaXQfT1pcMsQ03NAy1JxmyvTq+ngdY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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