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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6215926394b65526bc758fa3d02c069e427755450b682f2d1bb9cbf4577c9fe8' 
  AND token = 'XLTy+0hRoDA1l7LRzCOXDyq7zHr4yNr3NXkjCQToOxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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