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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101d70ad06d0e1fd78f63e048567c965a4e019926fec9e1cd4e17224e280112e' 
  AND token = '++gwKVOVY4j/O0cPBG3WkcCoGnVC3txlh+wTd+Ft6E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.04635

JSON explain

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