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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2888896b9a659fb8045fa20c969f81eb381441536035c9f5155bf0776785af96' 
  AND token = 'CuJevG/QuBMSSR5jaNHteptB2CNwPc/3uwTEEdIDXAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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