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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a72dd686274bb2d15886d72c41fc13964ea199edd59e6f4cd8c952cd78610a' 
  AND token = 'mR6FH4xf4/qbxeqvBPtNzY/HBDoW1OAOqRtUn449B8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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