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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899863fd9ffb36d9d7513b0ca58a81c8941b97d514a9b43746c9047fc60f9931' 
  AND token = '5+ebxLNsbGO++jeNulEcCYMTERz2dBxU5etSMKETqpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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