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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eedf138552c363fe5ebafa9a8ed9869bb6692d6af21739bd928d99eafa3ef53' 
  AND token = 'tqUygJmauS4Ut7AsVC86Sm435A/kTTuZYK08CacC6VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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