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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3c8f7908a6e098cd6c051c58ec2e76d869ee6aacbfea751345368a049a47eb' 
  AND token = 'y8K/eV4Riy8HgUqntNoX1KiKzuB9uGul+QE6A2BOIZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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