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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6b65d6ff903757b9a9be6ac831f922b7527ada4f0b295b40dbdcf4c2ae2686' 
  AND token = 'Zg0YLaxgbeKJXESo7Tp6ZUZd29ARjub3l3KYG5bqrJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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