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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1507d994428be6c150955d893fca265492d3c11ceca4c795c3a433bff3dfe01' 
  AND token = 'PwzoVF0N/Wh/er0cB6X2s4wtYTzC7w1CKSKjd4975uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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