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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c94d84a5c69cab5ac9627fec1c75bca199a7d5b88ba15c9ec51d102605f6565' 
  AND token = '0VBRUfOp+B7H59FaDdmer8L0KGBNg7gzZIjYnRVJuII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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