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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7073897a2ec69c976432163ce6ee8287d2cade2cd9fdabe061d53d57119972' 
  AND token = '0Z/PaLgKyc+BJXAWUdWxCFLxMqauS7RPxMHaxnKE15A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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