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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c86e361d13c8aa1781bdcba8df2f48f5fc9ef4335ba9ed2798df25138b2a6d5' 
  AND token = 'tujXpZb3jpsHxFqDoIapvcDpGnQ4PhLuwC800inNgUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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