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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20b39729a5812b141d30cc6f50aa5c0f298412ef9c9608fd72e0f005c135265' 
  AND token = 'qcIWskjGql1W3wFLnLlhdQUE5w7qhDyxFTVtC2H1EiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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