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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be008dc702a30abd10e28247fc37455c090e6a07d7bef3cde350a24d39c03dc' 
  AND token = 'x0o6wLLgcWF9reqV0h2T0YPI2OKwtUmTIMBnVHL29jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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