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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c20d56c77bd43a1ba40aaf2a23bd0a4229873b0c053e6cf23cd72512c68e9b' 
  AND token = '7G08lhfLhZEuId8098TCx9Nd91kpCKi1ZsVvNPFV7ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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