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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417ae4ab3a559a869e4d4c6f9129d8d146276c3b937904cfc59a45d2cbe069a8' 
  AND token = '3+vROchZRiJN0cYJ7/LGoSen8C/rp00zpUZ7Mi/HSJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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