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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48a9c1ed10d6d402d673a4649dedb72088a913c71e9cc93f924a9805379c788' 
  AND token = 'fox3/PPCzY2edROzt7cq1ShlQN4QDKWSNT2zyxfTXUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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