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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71b52ed07680985346c8e6ccb01bc52eaa81292f640901c50c60266333e08b5' 
  AND token = '8pp6+or/ifb7MbO39XWjmqrR5EKYa8DRtQhFy6v9s8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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