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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd1b7027e736bdb568e7246ce94988836fe9251d0a75ab75e7e7bcd12100c36' 
  AND token = 'OJe2TU3/4KwhfohsPvU9duNWIOW0l6WGX5lTcSYkMtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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