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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f683c3f7fb4f1737f57da2b586dc2086212f074f309709dbb5934b83f2655ce7' 
  AND token = 'PsaqddOGh2dnZiUnfWArDoXMIWsWD55Rgd+odIZWB88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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