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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aff30e0b0d29a9cb22477ce288946781080e86b66b668e6da209a07148d8835' 
  AND token = '8p9cEge6JuLS6dbdlDtqbJXor4nujbj1vippQDoyDr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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