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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fce139db5e5d68961fbe4437c4dc3e227cdb7e8a81d967950adc878c1cac3b1' 
  AND token = 'wEqD+m5ETmEqrOe/OeoHMhqEU3hMeaABwGmBX/sfMaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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