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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa885aaa0a8788723ff995d01c4b4e72b14c237b06ef7d8f65c8ccf352623da1' 
  AND token = 'knvdrbLnL3Qwoztcg9FyUS29KO1eVoTeIf+rC+AFYsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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