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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a82b768af4001945920b06be34e8472ac30d647dcc249c225a1eb779bf68c7' 
  AND token = 'zSJSu3UobOaXb4caqjuslU40TgJAk1JvWNIbXNwaAsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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