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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72170a141d66f4dc84b23897833738285aad7cd17b45a6c07333686b2101a83' 
  AND token = 'K/zRY7qK/fCCpRzDL1HaRq35QXheaVK4caPknnGczO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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