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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c386303d2f433a9145f68d3317374c636a1d1edaa7613b7cb1f8dbc165e087a9' 
  AND token = 'J8ScgZeAouIPognaWYQkOjNHwRQDATQg5ctVQyPfCqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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