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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c605355ddb32857e8f64a7e88b01eaee9ebea404d30f8dd1211228fc38109e80' 
  AND token = '1CoofCYkvStxooXuL1AR7daaO/5ynx1PoX1pAMQk548=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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