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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48e47fb1cd3e0d82316b9e49815df689dbfed60b9bc982973b329ebd4beb17a' 
  AND token = '2JP2ZPuTWkWPWjLpQ2opHuD/J7SXiQo/bSl9MEAOzA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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