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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb32ef2cf8a6cf8e44160e404d53b51c31c92ed2a780b8fbea3928ee0a258d06' 
  AND token = 'FGvecGJIaOlWv5ICpp1+KbriVIcrHow45aC8MhXvmyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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