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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b551e738046df9351306440deb2244ba5cd72cf529e911e0f1c357d92e6391' 
  AND token = '5Wmq2fS/HgLk1my4ie2J3xGAtobHszj4344kUXY6lsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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