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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fbb48b097b1b7a4f573f176490126e2055b71e3033f043f55a7d1ef763145e' 
  AND token = '95kWQUhuJIYuq4utxS/3ZFDUQmXToJHMeX8uOhmu3iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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