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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ba02c3366af2e3ba25a7c6a38fe91afee25de76821c25dd0c73ce3b9deaf12' 
  AND token = '0HvkrxasJgbFvz3fbP7a6xuZwOFQMKTVS5EpfelXcJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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