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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a5afb7faee3a892a04267a2dbfa02e19db4d836ae622cdb5029b2338429a2f' 
  AND token = 'HzWHKmFvv+qGhFFkMF8nde+M5Np+g9/fuxxUQJT5v6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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