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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7339d993b3980a18b8f9e6226dcc33bd64681520dfbcca8a14454fcb6ff5253f' 
  AND token = 'Z+7ODSj3fdYryin0Wv5bM9jtj+u5LhTTBG4h1rnZzlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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