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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30ee80be768e7a1a8619b4147a03704304e16679f60fcc0de7ce683f5da66e3' 
  AND token = 'J7ybLOkuQQ7ULG+RCIa77ywURU0zm/egg/TmAFWnC1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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